Dash-pot.



srArns PATENT OFFICE.

' EDWARD G. KAISER, 0F HOMEWOOD, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DASH-POT.

Application filed October 3,

To all whom, it may concern:

Be it known that I, EDWARD CHARLES KAL SER, a citizen of the United States, and a resident of Homewood, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dash-Pots, of which the following is a specification.

My invention relates to dash pots, and it has special reference to liquid-containing dash pots that areadapted for use in. connection with electrical apparatus, such as constant-current regulators.

The object of my invention is to provide a dash pot the speed of operation of which may be varied within wide limits and which shall be simple and inexpensive in onstruc: tion. In the accompanying drawing, Figure 1 is a side view, partially in elevation and partially in section, showing a dash pot constructed in accordance with my invention. Fig. 2 is a side sectional view showing thel piston structure.

In connection with certain forms of electrical apparatus, particularly in constant-i current regulators in which movable coils are employed for voltage-regulating purposes, it is usual to provide dash pots for limiting the speed at which such coils are permitted to move. Such dash pots are coimnonly of the type in which a piston reciprocates within an incloscd cylinder filledwith oil or other suitable liquid, an opening being provided in the piston through which the oil within the cylinder passes as the pisi ton is forced from one end of the cylinder to the other. According to my present invention, I provide a dash pot of the type just described with means for varying the extent of the opening through the piston, and I thereby render it possible to use a single size of dash pot in many different situations where the piston is required to operate at different speeds.

Referring to Fig. 1 of the drawings, a casing 1, which may be of cylindrical or other suitable form, is tightly closed at its upper and lower ends by a cover 2 and a cap 3. The cap 3 may conveniently be soldered to the lower end of the casing 1, and the cover 2 may be removably secured to the upper end of the cylinder by means of screws\ 4 or in any other suitable manner. Packing Specification of Letters Patent; V Patented Oct. 8, 1918.

19 14. Serial no. 864,732. 7

casing 1, in order to insure an oil-tight joint,

A piston rod 5 extends through an opening in the cover 2 and is rigidly secured, at its inner end, to a piston 6 that fits slidably within the casing 1. The outer end of the piston rod 5 is provided with a suitable connector 7, by means of which it may be attached to the regulator or other device with which the dash pot is to be used.

The piston rod 5 is hollow, its lower end being closed by a perforated plug 17, and is screwed into the piston 6. Within the lower end of the piston rod 5 is a solid plug 19 that is secured either rigidly or rotatably to the lower end of a rod 20 which extends the full length of the piston rod 5 and is provided with screw threads at its outer end which are engaged by a nut 21 that is exteriorly screw threaded to engage the internally threaded upper end of the piston rod 5. If the plug 19 is rotatably secured to the rod 20, it may be prevented from turning in the tube 5 by means of suitable ribs and slots, and in such case, it will have only a sliding movement in the tubular rod 5. The walls of the tubular piston rod are provided, near the piston 6, with one or more apertures 22, and the upper end of the rod 20 is provided with a. slot 23 to enable the rod 20 to be turned by means of a screwdriver or other suitable tool, whereby the plug 19 may be raised and lowered within the tubular piston rod, thus increasing or decreasing the effective size of the apertures 22.

It will be understood that the rapidity with which the piston 6 passes through the casing 1 depends upon the rate of liquid flow through the openings in the piston rod 5, and such rate of flow may be regulated by vertical adjustment of the plug 19 from the position shown in Fig. 2which permits a maximum liquid fl0wto any other desired position in which the openings are partially covered. Furthermore, attention should be paid to the fact that any desired adjustment may be easily and quickly effected from the outside.

Many structural modifications of my de- Vice may readily be devised by persons skilled in the art to which my invention appertains, and it is therefore to be under shown and described,butgisliinited only by the scope of the appended claims.

1 claim as my invention:

1. A dash pot comprising. api ston having a transverse opening, a hollow piston rod secured at one end Within the said opening;

and provided With an aperture in its Wall, a

member slidably disposed within thesaid hollow piston rodand adapted to Vary the effective area of the said aperture-and a'p'er' cured at one end Within the 'said'openingand' provided with an aperture in its Wall, aperforated plug disposed Within the end of the said piston rod adjacent to the said piston, a member slidablv disposed Within thesaid hollow piston rod and adapted to vary the efleotive area of the said aperture, and means operable from the exterior of the dash pot 101 varying the position of the said nieni- In testimony whereof, I have hereunto SHbSCIlbG'd ID V"11211116 this 23rd day of September, 1914.

EDlVAR-D C. KAISER.

lVit-nesses:

WV. DOANE, B B} HI'NEs;

Copies of this patent may be obtained for fiire cents seem-by addressing the Commissioner of Patents,

Washington, D. C. 

